Added a first version of the particle explosion effect, reconstructed using Unity's particle system as close to Quake's original particles as I can right now.

Assets/Scripts/Modules/GameModule.Interop.cs

@@ -17,6 +17,8 @@ public partial class GameModule : CallbackHandler<GameModule>
             RemoveEntity = CreateCallback<GameRemoveEntityCallback>(Callback_GameRemoveEntity),
             UpdateEntityAnimation = CreateCallback<GameUpdateEntityAnimationCallback>(Callback_GameUpdateEntityAnimation),
             SetEntitySkin = CreateCallback<GameSetEntitySkinCallback>(Callback_GameSetEntitySkin),
+            
+            ParticleExplosion = CreateCallback<ParticleExplosionCallback>(Callback_ParticleExplosion),
         };
         
         RegisterCallbacks(callbacks);
@@ -33,6 +35,8 @@ public partial class GameModule : CallbackHandler<GameModule>
         public IntPtr RemoveEntity;
         public IntPtr UpdateEntityAnimation;
         public IntPtr SetEntitySkin;
+        
+        public IntPtr ParticleExplosion;
     }
 
     [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
@@ -89,4 +93,15 @@ public partial class GameModule : CallbackHandler<GameModule>
         GetSelf(context).SetEntitySkin(entityNum, skinNum);
         Profiler.EndSample();
     }
+    
+    [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
+    private delegate void ParticleExplosionCallback(IntPtr context, ref QVec3 origin);
+
+    [MonoPInvokeCallback(typeof(ParticleExplosionCallback))]
+    private static void Callback_ParticleExplosion(IntPtr context, ref QVec3 origin)
+    {
+        Profiler.BeginSample("ParticleExplosion");
+        GetSelf(context).ParticleExplosion(origin.ToUnityPosition());
+        Profiler.EndSample();
+    }
 }

Assets/Scripts/Modules/GameModule.cs

@@ -67,4 +67,9 @@ public partial class GameModule
     {
         uq.GameState.GetEntity(entityNum).SetSkin(skinNum);
     }
+    
+    private void ParticleExplosion(Vector3 position)
+    {
+        uq.CurrentStyle.Particles.CreateExplosion(position, uq.GameLayer);
+    }
 }

Assets/Scripts/VisualStyle.cs

@@ -155,9 +155,24 @@ public class ParticleSystems
     [SerializeField]
     protected ParticleSystem explosion;
 
-    public virtual void CreateExplosion(Vector3 position)
+    public virtual void CreateExplosion(Vector3 position, Layers layer)
     {
+        if (explosion == null)
+            return;
+    
         var go = Object.Instantiate(explosion.gameObject);
         go.transform.position = position;
+        SetLayer(go, layer);
+    }
+
+    protected static void SetLayer(GameObject go, Layers layer)
+    {
+        go.layer = (int)layer;
+
+        int childCount = go.transform.childCount;
+        for (int i = 0; i < childCount; ++i)
+        {
+            go.transform.GetChild(i).gameObject.layer = (int)layer;
+        }
     }
 }

Assets/Styles/GLQuake/GLQuake.asset

@@ -23,4 +23,5 @@ MonoBehaviour:
     lavaAlpha: 0.9
     teleAlpha: 1
   particles:
-    explosion: {fileID: 0}
+    explosion: {fileID: 9150008102338277659, guid: 94e2cf23692eef24d9a5145b0f705c55,
+      type: 3}

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engine/Quake/r_part.c

@@ -385,6 +385,8 @@ void R_ParticleExplosion (vec3_t org)
 			}
 		}
 	}
+
+	UQ_Game_ParticleExplosion(org);
 }
 
 /*

engine/Quake/render.h

@@ -178,4 +178,6 @@ void R_SetVrect (vrect_t *pvrect, vrect_t *pvrectin, int lineadj);
 typedef struct mleaf_s mleaf_t;
 void UQ_GL_SetupView(vec3_t origin, vec3_t angles, mleaf_t *viewLeaf);
 
+void UQ_Game_ParticleExplosion(vec3_t origin);
+
 #endif	/* _QUAKE_RENDER_H */

engine/UniQuake/game_uniquake.c

@@ -9,6 +9,7 @@ typedef struct unity_gamecalls_s
 	void(*RemoveEntity)(void *context, int entityNum);
 	void(*UpdateEntityAnimation)(void *context, int entityNum, int pose1, int pose2, float blend);
 	void(*SetEntitySkin)(void *context, int entityNum, int skinNum);
+	void(*ParticleExplosion)(void *context, vec3_t origin);
 } unity_gamecalls_t;
 
 static void *unity_context;
@@ -44,3 +45,8 @@ void UQ_Game_SetEntitySkin(int entityNum, int skinNum)
 {
 	unity_gamecalls->SetEntitySkin(unity_context, entityNum, skinNum);
 }
+
+void UQ_Game_ParticleExplosion(vec3_t origin)
+{
+	unity_gamecalls->ParticleExplosion(unity_context, origin);
+}